a sample contains 7.90 g c and 42.1 g s. you want to determine the empirical formula. how many moles of c…

a sample contains 7.90 g c and 42.1 g s. you want to determine the empirical formula. how many moles of c are in the sample? ? mol c do not round your answer.

a sample contains 7.90 g c and 42.1 g s. you want to determine the empirical formula. how many moles of c are in the sample? ? mol c do not round your answer.

Answer

Explanation:

Step1: Recall mole - mass formula

The formula to calculate the number of moles $n$ is $n=\frac{m}{M}$, where $m$ is the mass and $M$ is the molar mass. The molar mass of carbon $C$ is $M = 12.01\ g/mol$.

Step2: Substitute values

We are given that the mass of carbon $m = 7.90\ g$. Substituting into the formula $n=\frac{m}{M}$, we get $n=\frac{7.90}{12.01}$.

Answer:

$\frac{7.90}{12.01}$